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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96ffc6226f5e929c49d3092916548873e522a30ff8a8490a90935c84bbde686e' 
  AND token = 'AGS7asKLsgcEqDOE9WWG/2SqpA1dWw+WbC+0kgp8k4U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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