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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '275fcd5f227ca4af94105d80240857e0ff9b07b4e358a48ed0c2c4cb339dd99d' 
  AND token = 'f1p0rLNpNl86Fw2NkEu94Q+aURGSg/kTalalepX/35g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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