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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd01acbfbba1c554b1018f5bf96ba611ea6f8a2a0d314f107d82c1d2ada27f2b8' 
  AND token = 'AKQ3EBKJuMQf7iSTZim/JA5qovTssYFoR4SknvkKY/g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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