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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '33d44dc87b58140ed9cc018ed5a9b5920be5449385aacbeca31799d286a4b69e' 
  AND token = 'csfeIOWdi5zcIkBVZwfEndPlDA7AqFcaH4Y1/EQzO3U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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