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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0156ff3337ac8678d19ae716244f54cbe94aae3a42b7e010168e7b97d2af6bd1' 
  AND token = 'TvNBLxMb6ZZ8sjhuE78I7pN8y45xNowfrKSEnx2fOsY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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