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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc651b8a98bfa53266e47b1434d754a4bad8e5095f3795fee969446f1bc2a5e0' 
  AND token = 'ElXVRy8HArYpQKVouqaXX1/pYflwc6tks7IiPnDe3Rc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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