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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed10f74c5eaa24b7a9c2bbb9c156df2376651f29a03feb8bddab5dc2536b331d' 
  AND token = 'c/4b2viakdgZFOZmEt9nvEvTnF2mdfNFNhsggGp5hJs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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