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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cdee88d72d4ea3e0ede0674eae9a94027903ec9edc64ccd5279d521d131eb570' 
  AND token = 'coR+MR5JAdNhjjhEjSx2yJbcKq1yNpB4sN070V5waFM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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