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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '357e8a294809aa5d335ab673f0dae5bffd3c513a2d48c16105f32330a2fb0f76' 
  AND token = 'm2jCBoUUgn16X70qgEw+8ibTS7QR4BqfY2qCb+lDr/o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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