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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7a552a2c6a9c2cd7dc1f63c70ebbce8b2b485d6555d84fa0338299143722c1a' 
  AND token = 'xkN+lPQFiCU4o1mF1cr3NaycEq1TrL1WH4yQGkY6xy4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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