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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92bea91632b44a93bf229fcc8a60be7627cc2198a6fefdd5c6558ed41ccd331d' 
  AND token = 't7zkF7lLBMxyxsG9JgYosQyq35kvacd9aN1oqmXM7is=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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