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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b524a79d1e00416c836f37c05146fd5e4ef9e030a47d02097e832597836fbda' 
  AND token = '/LEX9FDeCc/OaTVXPZywQEvCdNBOZXOJ+NXDR209dTM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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