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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb6311de208cd92c3a338a9a4640e989c89a522ce6b3b29a9d2b8282986a5c58' 
  AND token = 'L1701Rcv5JuHYgw9Bb8SCiYkiv6olHpg5DjTI6QXqEI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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