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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e918dc9363c9489fc6c1a5c00cd24b4735b7dc800108c49048778c64fb58f9f' 
  AND token = 'PfXMCVQBQ1O3cIJ0IcScloKCcyc70c+uZ70Scxcixps=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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