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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '687fc0dc6fa1ec0b4c81c01815f0bd46dd41f99477397354778bf58fad00355b' 
  AND token = 'PxaVnk6Xw5Yher2NtiTEwCEhvUBOngQN4r37z3/I99M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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