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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e4e3e4c5b0bc5119ed509f067dd667e9866c1dfde831f781cd86d598078115c' 
  AND token = 'bjWQrem7xFoPXal7RLmv3xrmUnpkdQUwP/AAKBuZCNE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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