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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a595dd07cde13c8f5fc0fb3a9b0a810ef7cfc92a616b4ae475efaba4dc547de7' 
  AND token = '5l6FfDkxLY1ozXZ75VML69MgklVnN997W5JGdPri6ps=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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