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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7eb29d0bf8d0a4893d7f2eb8e8b792c0fa75a34273956efbb2eb349ae5f40ecf' 
  AND token = '4bIf9BT4/ALrNO+YS8pbJmlt/5fvjALTLbUAewPyXWo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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