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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '996f05547f2ebf184e1fffeca397a118a19b9017384ee0fa8da78ba9fb3ec491' 
  AND token = 'gEf3rigKUC3mlvtucMlJGoKXoclH1/j8oTXLGtM9QCM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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