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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13d15a70b45fa476463f4d8f405f4993656dd9df7ee3a1f009d2425075b3fdf4' 
  AND token = 'kL1wXDukrwExos3/T2ejot3FwrQFgc8vzyCn5qZPoDA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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