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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77604e5322d8f062891235d4215f27e5d7128a4c28deee062005958fafaaecbe' 
  AND token = '7Z5+uCh98ST1Fa3Kg7zQ7ZHuh5foNF0b5CWts/+s/eo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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