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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8588a35bfc7e5b71fa513e3e5d8eae149c3332845fea438cddd828efa467c55a' 
  AND token = '+ZcwSup6xcVKW+yf/Q0osU+82qC4nf4AVEnLV1KohAo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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