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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc1057514c02115396a8a0df41f4800098df82f31b5f71bd408c00aa3dcd9ed6' 
  AND token = '2gYTq2ffnBWE1SzfRPrbT1ciS1X1HXSARq9fR1TMrpw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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