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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8e37d73f30a4f6266e522cbf39881d375ff3256e9522de173c47998aa48263b' 
  AND token = 'cQuVo8JdcZsRdU0tD1MuaeUP6Z1itq8neQsKmUOjqxE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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