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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b2b83b0b75d753c8d03d701a58deb59999ff455bf1401d5266b0a775cb9d070' 
  AND token = 'RtDlFmEwdzRnCovhPlRuV+jV+us9PuT66kuGtELhEn8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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