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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2b3f9721358e88f8ef991e976b56b2c9dcbd2252c169c925e0899ca2e08194e' 
  AND token = 'cxX80iRC/924wMRkWFHFYCYlLtfBr8VH8ZD6MI99CpA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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