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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cdb10f90674d75cd2a1172c1b8fe26666f86690a3c73ef63ae0ab429069573e1' 
  AND token = '8ke8AfUCKUwRk1/SuJDvp/bTIRjVDOW47MTlgY0uEh8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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