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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '470a50a48f82b1d4e4c03c3061044124151f9e8e0016932cb61d0d6da4bfa372' 
  AND token = 'lrqabQ6D3MkbCGG2tX6Nv2qf73AjZPr9sX0ZuTKGL/A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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