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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4af58b39d95143d161176d28b1f7d7e81dcafa873d0c366d6ccbd2f3f88c5db2' 
  AND token = '0xM1AZHvZcIPEM8n2bGlm0ASbNo+2a+bogW5Zv6m9F8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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