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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c90c1e2e2f1b3fddacdca57850ff1acb31bc0e3324c649add37c62c4ecc99b34' 
  AND token = '+0HPvpf8F+sIGcvB7b1wOOknL0Cf6UFE6uJzl0X0rFE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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