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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb802651377d61f066d00e95b707f718511c2ca4c789456382f596f8105128bd' 
  AND token = 'Ov7k6S7MdWDWbURhlpu42R0IB4yuJAdmbXpu9Q4jzcA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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