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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ea2bae713d1de183d055fa432def15283cd19dd7632087e2c138d063ee85570' 
  AND token = '316jhxThfwbGtG8JKHj343N1yKgmMX5YCeaUgnfvVWg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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