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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '44ae81a7bbbf93479ba96063f6b91a6495b281b2f9d58ac642e4058392039950' 
  AND token = '4pd/x0ifosx0kncFumEN7x3Oq2iD+uoNsSIrqRBYH0o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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