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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0940e1668749cfeb8a01dba21d95159eee11a4b9c6d809ae078d1a506d10fec9' 
  AND token = 'GPAJSYQ1oWpqAv+GY/4Qg54IlJuatnxC4I4fJZsb8Fs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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