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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2511ac4a0c8d060f1ff8088f28d421c3a482c2784c44e7578914e135ef844f63' 
  AND token = '7p2hRmIANW3QyNPc7Q0KZUJP0qxWl5JgCaHpNERDYYA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00133

JSON explain

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