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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93e752d1468693587a2ce7dfa0e1983056d47bfa23e1fb9c675bf2729c54c2fa' 
  AND token = 'ZleVl8fVea5wVFMzHeGgRApeMR6d4SUdy8+XHHKUF/w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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