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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1aac74aec4ed2b50ecc09e46e3494331556f6d248db9a003f3627bfe22225733' 
  AND token = 'MT3ex7tIZrdGq3wQSk23kGx2iGcwgw5LrdNW7i9KtxY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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