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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3cfe02bfba2629ad4408e75115eb112d4d9caac3615b2df99e900376c8da91d' 
  AND token = '9eoJNuZDxj9jVAAxuUeenITbruOwsRJEck46wmcW/is=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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