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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd25671617cbaefcf2e96e7ed2b24924a59056adffb2438cb57ae66963ccfe14f' 
  AND token = 'cB+kPW1yaprS6jccGnmw0DncA2DDAsdf/O26YRNR9+s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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