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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b92a94bf02aff7c4b3e6dbcae5c285e29bcd8cedbd0854a2d09874782bedb36' 
  AND token = 'X/Dg10wjRhUfzw/n5JEk5tRs577WmSKS0s0g0jsvL0U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00061

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}