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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7050b7647802775832cef3774a027d0938c8e8ab6a5239396156fc3443cf47cd' 
  AND token = '/j5XOuoe4L3nNDPaaGTO74LItM9mwkmpY6i7YWiw/Cc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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