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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56f8d373dc080c18eac2a6c075eb82fc2e07ea1d8c9a7a6f61938d47fe9c0f49' 
  AND token = 'Wa8FEX2zueNP0V0WeKXz+QRhxk0me0HLqc+bcY/R56M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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