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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3d27b95d780ac451e9a5a216fecbb3d225c7e650925df66ea4a144e5a8b3d3f' 
  AND token = '32A7cv8c9Ab3z8PpSqk5tYAdy63McgaptfTNGcG9hrA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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