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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe7d38c3bc54dfd39dbe321c5bcdc95dfcc8a954595f2aa91877c386ed660cdc' 
  AND token = 'nSUiCr0YYKee2jyPoMWbWulc0QZR+cWKptqJvMCpzdY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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