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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7cec4c919679f0405e69971f56f44cca54bc1619a86c63eda59484c8c2461de8' 
  AND token = 'XOQ4HnW/4gMxfMuzWs6nmv22ofq9dR/Ln5fy9Nvsd1s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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