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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77802cd0b15bc93c2f6e15d46477564e0e73f4ed581650414865ac015f732c31' 
  AND token = 'J7DBgH2FXD42pjD3n9NL0QLUILFV3DZdjre9XwfnneI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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