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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6da285ab48356ab351fbbbbfafb25c66b94a58ce31d536cd788f0d1ba15965c' 
  AND token = 'D/uH8OV30QnY9AkFAqWoCFxNkiR5AD5B89F3lkn4MAo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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