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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bba316b5cf388bce3992cbab293600f47f1e767e1afd8a7a2573ace244c3e7e9' 
  AND token = '5dvMmGYsR7mz2hCjPHXH3l2Z0JRq2Niv9ZO097/Fhoo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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