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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b4cac9bd89d440b1c5e8ea8750453ab2bea871265df97e330a636ca4b844fe7' 
  AND token = 'lmC4CU7uFqibxR4O9UQ8Sh4L5IfNss0hSAy8i6PSEV4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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