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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc555b084ef5542feabfa988b40f61e31660d00ce75e38d5d41217afe10b37c0' 
  AND token = 'LgKvxgSez3Ai87i6S+zy14SqSwMsyOzalVyXEz+iGSk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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