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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4ec775b4c7cd840dcbd9f01f41ebca22e351855b4c049360fadf33a5d7b8783' 
  AND token = 'ChjPLwPBbF58yil0q0hsxe0aLsy9zSmepH6C4IpseWA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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